[ phillips' lady ] live the regular life. phillips'. how they'll live tomorrow. for more than 116 years, ameriprise financial has worked for their clients' futures. helping millions of americans retire on their terms. when they want. where they want. doing what they want. ameriprise. the strength of a leader in retirement planning. the heart of 10,000 advisors working with you one-to-one. together for your future. ♪ >>> it is one of the most famous and enduring american mysteries, what happened to jimmy hoffa, the teamster's boss who went missing without a trace in 19 # 5. well, now investigators are back on the case just outside detroit. and nbc's john yang is there. >> reporter: could these six-foot cylinders with dark, muddy water, six feet in diameter, hold the answer to the mystery of jimmy hoffa? this man said he saw the body buried years ago, and where ground-penetrating radar showed something, two feet deep. >> we're just doing our job, we had credible information and had to follow through with it. >> reporter: police said when he disappeared in 1975, t